• Red open NKST box showing bottle and aftercare on white background
  • Red NKST box with bottle on white background
  • infographic || Award winning smooth, blocks humidity & eliminates frizz, long lasting smoothness & shine, reduces blow-dry time & increases manageability, results lasts up to 5 months
  • Before and after of a woman with long dark hair — on the right bottom, her hair is frizzy; on the right top, it’s smooth

    Before

    After

  • NKST Video
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NKSTNatural Keratin Smoothing Treatment System

NKST Natural Keratin Smoothing Treatment System

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Enjoy up to 5 months of smooth, shiny, manageable hair with our award-winning signature Natural Keratin Smoothing Treatment for sleek strands. Clients looking for smooth, shiny, more manageable hair with the maximum longevity. 

  • Natural Keratin Smoothing Treatment smoothes unmanageable hair and protects it from humidity.
  • Salon professional smoothing system is formulated with proprietary Signature Keratin technology for hair repair and protection.
  • Delivers shine and softness as well as repairs damage for healthier hair.
  • Dramatically reduces blow-dry time.
  • Enhances hair color vibrancy. 
  • Cumulative hair smoothing results.

WHAT IT IS

Enjoy up to 5 months of smooth, shiny, manageable hair with our award-winning signature Natural Keratin Smoothing Treatment for sleek strands.

WHO IT'S FOR

BEST FOR: Clients who want classic, long-lasting smoothing with frizz elimination, luminous shine, and maximum manageability across all hair types.

  • Clients looking for long-lasting, classic smoothing results
  • Eliminating frizz and delivering luminous shine
  • Hair that requires higher iron temperatures
  • All hair types

WHY WE LOVE IT

  • Natural Keratin Smoothing Treatment smoothes unmanageable hair and protects it from humidity.
  • Salon professional smoothing system is formulated with proprietary Signature Keratin technology for hair repair and protection.
  • Delivers shine and softness as well as repairs damage for healthier hair.
  • Dramatically reduces blow-dry time.
  • Enhances hair color vibrancy. 
  • Cumulative hair smoothing results.
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Keratin Complex Treatment Collections

Find out about our keratin treatments.

Our full portfolio of customizable keratin smoothing treatments is designed to make your hair healthier, stronger and smoother.

LEARN MORE

Overall rating: 4.8513513 / 5 from 74 reviews.

AI Generated Review Summary

The NKST Natural Keratin Smoothing Treatment System offers up to 5 months of smooth, shiny, and manageable hair. Customers praise its long-lasting results and ability to protect hair from humidity. While most users report smooth and healthy hair, some areas may not be as smooth.

Summary topics

  • Treatment Effectiveness (28%): A significant number of customers loved this treatment, describing it as the best they have ever used.
  • Longevity of Results (40%): A substantial number of customers raved about the amazing and long-lasting keratin smoothing treatment.
  • Hair Smoothness (20%): The feedback is varied, the hair is always smooth and healthy, but some parts are not as smooth as others.

Review topics: [smell, results, hair, shipping, treatment, clients, smoothing system, keratin].

Review highlights

  • "I love the keratin treatment it always leaves me with amazing results and happy clients!" — Courtney A.
  • "My clients love the results and longevity of the treatment." — Valerie
  • "Love the product and the results !" — Lauren W.

Reviews

Keratin purchase

"I love this keratin treatment, I have used other brands, and keratin complex is the best treatment I ever used!! Shipped promptly, and arrived safe!"

— Kami S. (5/5)

The product is great but

"The product is great but it took almost 2 weeks to receive it. Watching the shipping details it was 3 days before the label was even printed for it to be shipped. Terrible shipping service"

— Vicky W. (3/5)

Yes absolutely 💯 love this

"Yes absolutely 💯 love this keratin complex"

— Allison S. (5/5)

Broken pump on 33 oz shampoo bottle

"The pump on the tall shampoo bottle does not work. Contacted Keratin Complex requesting a replacement pump so that I can retrieve the product from the bottle, but I have not received a response. It’s been weeks."

— Nikki L. (1/5)

Keratin Complex

"Love how there's no strong odor, and love that the product does not make a lot of smoke when you blow dry or flat iron the hair. ."

— Joseph G. (5/5)

Frizz Free

"As a professional hairstylist, I appreciate the consistent results this keratin treatment provides. It helps reduce frizz while leaving hair soft, smooth, and easier to manage"

— Sahel S. (5/5)

Not really worth it

"I switched back to KC from Brazilian Blowout and I regretted it. Not worth charging $300 for this treatment that does nothing for the frizz. Very disappointing"

— Bellini C. (2/5)

owner

"always the best"

— Brandon J. (5/5)

Amaazing

"Always a great add on to any service !"

— Crystal J. (5/5)

"Loved it so much i had to order the bigger size! My clients have been loving the results as well!"

— Cynthia (5/5)

Q&A

Does Keritan Complex NKST have any formaldehyde or methylene glycol? If it is not used specifically, does the heat of flat ironing process release formaldehyde from other chemicals used into the air? Thank you.
Hi Sandy, Our NKST does not contain formaldehyde or Methylene Glycol. Once heat is applied, it is possible for an aldehyde gas to be emitted. After many tests in our lab, any gas emitted will be well within the OSHA limit. For more information, please feel free to contact our Customer Service Team at 888-409-4445 or info@keratincomplex.com
Is keratin complex safe during pregnancy
Hi Lindsay, While Keratin Complex has not received any reports of its in-salon service products causing changes in pregnancy, we acknowledge our service products are considered chemical. As a manufacturer, we are confident in the safety standards of our products, but as with anything chemical or artificial, a woman who is pregnant or nursing should seek the advice of her physician. You can also reach out to our Customer Service team at 888-409-4445 to request Safety Data Sheets.
Is this safe for color treated hair? Or bleached hair? I know there is a blonde treatment but if I have this one, could I use it?
Yes, all our treatments are safe for color treated hair.
Is it possible to purchase the keratin Treatment without the shampoo & kit as I already have that? Also what size is the actual keratin treatment? Thank you.
Hi Soledad, We only offer our treatments with all the products needed to successfully complete each treatment. The duos were designed to be certain that you have enough KCPRIMER to last the life of the bottle of treatment. Typically you are washing at least 2 times with the KCPRIMER which uses about an ounce of KCPRIMER. Therefore, you should be close to empty when you are ready to reorder treatment. However, if you find you do have excess of KCPRIMER, it is a great mild de-mineralizing shampoo prior to color for your clients that have hard water or swim a lot as it is very gentle and doesn’t strip color. You could utilize it as an add-on “hair detox” service for a fresh clean slate on the hair. We offer our KCEXPRESS in 4 oz. 16 oz. and 33.8 oz.
How many applications will I get out of the 4oz kit of the NKST treatment?
You should be able to get at least 2 applications out of our 4 oz NKST. We recommend using no more than 1.5 oz per guest. Although, you can use more if there is an overabundance of hair. You want to make sure you are not oversaturating.